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Iron deficiency anemia  causing blue skin under the eyes. If there is a shortage of iron in the body, oxygen cannot be properly transported by the blood. Hemoglobin is the oxygen transporting component in the blood, moving oxygen from the lungs to the cells where it is released for normal cell metabolism.
Here are ten telltale signs of iron deficiencyâ¦ 1. Pale Complexion. If your naturally rosy hue is suddenly pale and blanched, you may be iron deficient. Reason being iron promotes hemoglobin production, the source of your pink and luminescent glow.